Thursday 26 May 2011

Composition of Water






How to determine the electrode (anode and cathode) ???

- Look at the battery terminal
- Electrode which is connected to the negative terminal is CATHODE
- Automatically you know ANODE is the electrode connected to the positive terminal of battery.

How to identify the gases collected at the electrode???

- CATHODE : you can find the letter H in the spelling, so remember H for HYDROGEN. ;)
p/s : [ no H in anode]

- So at ANODE, oxygen is collected.

How to test the gas???

- At cathode - HYDROGEN - using burning splinter (kayu uji bernyala). Api akan terpadam dan menghasilkan bunyi "pop".

- At anode - OXYGEN - using glowing splinter (kayu uji berbara). Api akan menyala.

If the volume of hydrogen gas collected is 30cm³ , what is the volume of oxygen collected???

- The ratio of H:O is 2:1 ;- so 15cm³ of oxygen is collected.




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